check_system_info.info

Let’s break down what this script does in detail. The script is named check_system_info.sh, authored by GJS (homelab-alpha), and its purpose is to check various aspects of system information. It provides details about system uptime, hardware information, system temperature, systemctl status, RAM/SWAP usage, disk usage, disk usage inodes, and last reboot/shutdown events.

Here’s a detailed explanation:

Script Metadata link

• Filename: check_system_info.sh
• Author: GJS (homelab-alpha)
• Date: May 18, 2024
• Version: 1.0.1
• Description: This script checks system information. It provides details about system uptime, hardware information, system temperature, systemctl status, RAM/SWAP usage, disk usage, disk usage inodes, and last reboot/shutdown events.
• RAW Script: check_system_info.sh

Script Structure and Functions link

Print Section Separators link

The script includes a function print_separator to print a line separator for clarity.

print_separator() {
    echo "────────────────────────────────────────────────────────────────────────────────"
}

Check if a Command Exists link

A helper function command_exists checks if a command is available on the system.

command_exists() {
    command -v "$1" >/dev/null 2>&1
}

Initial Information link

Prints the current date, user, and system uptime.

print_separator
echo "$(date) │ $(whoami)@$(hostname --all-ip-addresses) │ $(uptime --pretty)"
print_separator

Checking for Required Commands link

Check for Required Commands link

It checks if the necessary commands (sensors, hostnamectl, df, last) are available and lists any missing commands.

missing_commands=()
if ! command_exists "sensors"; then
    missing_commands+=("sensors")
fi
if ! command_exists "hostnamectl"; then
    missing_commands+=("hostnamectl")
fi
if ! command_exists "df"; then
    missing_commands+=("df")
fi
if ! command_exists "last"; then
    missing_commands+=("last")
fi

if [ ${#missing_commands[@]} -eq 0 ]; then
    echo "All required software is present."
else
    echo "The following software is missing:"
    for cmd in "${missing_commands[@]}"; do
        echo " - $cmd"
    done
    echo "You can install missing software manually using your package manager."
fi

Detailed System Information link

System Info link

Prints system model information and hostname details.

print_separator
echo "System info:"
echo ""
if command_exists "cat"; then
    cat /proc/device-tree/model
else
    echo "ERROR: 'cat' command not found."
fi
echo ""
if command_exists "hostnamectl"; then
    hostnamectl
else
    echo "ERROR: 'hostnamectl' command not found."
fi
print_separator

System Temperature link

Checks and prints system temperature using the sensors command.

echo "System temperature:"
echo ""
if command_exists "sensors"; then
    sensors
else
    echo "ERROR: 'sensors' command not found."
fi
print_separator

Systemctl Status link

Displays the status of failed system services.

echo "Systemctl status:"
echo ""
if command_exists "systemctl"; then
    systemctl --failed
else
    echo "ERROR: 'systemctl' command not found."
fi
print_separator

RAM/SWAP Usage link

Shows RAM and SWAP usage using the free command.

echo "RAM/SWAP usage:"
echo ""
if command_exists "free"; then
    free --human
else
    echo "ERROR: 'free' command not found."
fi
print_separator

Disk Usage link

Provides detailed disk usage information.

echo "Disk usage:"
echo ""
if command_exists "df"; then
    df --human-readable --type=ext4 --output=source,size,used,avail,pcent,target
else
    echo "ERROR: 'df' command not found."
fi
print_separator

Disk Usage Inodes link

Shows inode usage of the disk.

echo "Disk usage inodes:"
echo ""
if command_exists "df"; then
    df --human-readable --inodes
else
    echo "ERROR: 'df' command not found."
fi
print_separator

Last Reboot/Shutdown Events link

Displays the last three system shutdown events.

echo "Last reboot/shutdown:"
echo ""
if command_exists "last"; then
    last --system | grep shutdown | head --lines=3
else
    echo "ERROR: 'last' command not found."
fi
print_separator

Conclusion link

The script is well-organized, providing clear output of the system status and any missing software that may be needed to perform certain checks. It’s handy for quickly diagnosing the state of a Linux system.